patch-2.2.15 linux/net/irda/ircomm/ircomm_lmp.c

• Lines: 323
• Date: Fri Apr 21 12:47:16 2000
• Orig file: v2.2.14/net/irda/ircomm/ircomm_lmp.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from ../../exclude v2.2.14/net/irda/ircomm/ircomm_lmp.c linux/net/irda/ircomm/ircomm_lmp.c
@@ -0,0 +1,322 @@
+/*********************************************************************
+ *                
+ * Filename:      ircomm_lmp.c
+ * Version:       1.0
+ * Description:   Interface between IrCOMM and IrLMP
+ * Status:        Stable
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Sun Jun  6 20:48:27 1999
+ * Modified at:   Sun Dec 12 13:44:17 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * Sources:       Previous IrLPT work by Thomas Davis
+ * 
+ *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
+ *     
+ *     This program is free software; you can redistribute it and/or 
+ *     modify it under the terms of the GNU General Public License as 
+ *     published by the Free Software Foundation; either version 2 of 
+ *     the License, or (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License 
+ *     along with this program; if not, write to the Free Software 
+ *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
+ *     MA 02111-1307 USA
+ *     
+ ********************************************************************/
+
+#include <linux/sched.h>
+#include <linux/init.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irlmp.h>
+#include <net/irda/iriap.h>
+
+#include <net/irda/ircomm_event.h>
+#include <net/irda/ircomm_lmp.h>
+
+/*
+ * Function ircomm_open_lsap (self)
+ *
+ *    Open LSAP. This function will only be used when using "raw" services
+ *
+ */
+int ircomm_open_lsap(struct ircomm_cb *self)
+{
+	notify_t notify;
+	
+	IRDA_DEBUG(0, __FUNCTION__ "()\n");
+	
+        /* Register callbacks */
+        irda_notify_init(&notify);
+	notify.data_indication       = ircomm_lmp_data_indication;
+	notify.connect_confirm       = ircomm_lmp_connect_confirm;
+        notify.connect_indication    = ircomm_lmp_connect_indication;
+	notify.disconnect_indication = ircomm_lmp_disconnect_indication;
+	notify.instance = self;
+	strncpy(notify.name, "IrCOMM", NOTIFY_MAX_NAME);
+
+	self->lsap = irlmp_open_lsap(LSAP_ANY, &notify, 0);
+	if (!self->lsap) {
+		IRDA_DEBUG(0,__FUNCTION__"failed to allocate tsap\n");
+		return -1;
+	}
+	self->slsap_sel = self->lsap->slsap_sel;
+
+	/*
+	 *  Initialize the call-table for issuing commands
+	 */
+	self->issue.data_request       = ircomm_lmp_data_request;
+	self->issue.connect_request    = ircomm_lmp_connect_request;
+	self->issue.connect_response   = ircomm_lmp_connect_response;
+	self->issue.disconnect_request = ircomm_lmp_disconnect_request;
+
+	return 0;
+}
+
+/*
+ * Function ircomm_lmp_connect_request (self, userdata)
+ *
+ *    
+ *
+ */
+int ircomm_lmp_connect_request(struct ircomm_cb *self, 
+			       struct sk_buff *userdata, 
+			       struct ircomm_info *info)
+{
+	int ret = 0;
+
+	IRDA_DEBUG(0, __FUNCTION__ "()\n");
+
+	ret = irlmp_connect_request(self->lsap, info->dlsap_sel,
+				    info->saddr, info->daddr, NULL, userdata); 
+	return ret;
+}	
+
+/*
+ * Function ircomm_lmp_connect_response (self, skb)
+ *
+ *    
+ *
+ */
+int ircomm_lmp_connect_response(struct ircomm_cb *self, struct sk_buff *skb)
+{
+	int ret;
+
+	IRDA_DEBUG(0, __FUNCTION__"()\n");
+	
+	ret = irlmp_connect_response(self->lsap, skb);
+
+	return 0;
+}
+
+int ircomm_lmp_disconnect_request(struct ircomm_cb *self, 
+				  struct sk_buff *userdata, 
+				  struct ircomm_info *info)
+{
+        struct sk_buff *skb;
+	int ret;
+
+	IRDA_DEBUG(0, __FUNCTION__ "()\n");
+
+        if (!userdata) {
+                skb = dev_alloc_skb(64);
+		if (!skb)
+			return -ENOMEM;
+		
+		/*  Reserve space for MUX and LAP header */
+		skb_reserve(skb, LMP_MAX_HEADER);		
+		userdata = skb;
+	}
+	ret = irlmp_disconnect_request(self->lsap, userdata);
+
+	return ret;
+}
+
+/*
+ * Function ircomm_lmp_flow_control (skb)
+ *
+ *    This function is called when a data frame we have sent to IrLAP has
+ *    been deallocated. We do this to make sure we don't flood IrLAP with 
+ *    frames, since we are not using the IrTTP flow control mechanism
+ */
+void ircomm_lmp_flow_control(struct sk_buff *skb)
+{
+	struct irda_skb_cb *cb;
+	struct ircomm_cb *self;
+	int line;
+
+	ASSERT(skb != NULL, return;);
+
+	cb = (struct irda_skb_cb *) skb->cb;
+
+	IRDA_DEBUG(2, __FUNCTION__ "()\n");
+ 
+        line = cb->line;
+
+	self = (struct ircomm_cb *) hashbin_find(ircomm, line, NULL);
+        if (!self) {
+		IRDA_DEBUG(2, __FUNCTION__ "(), didn't find myself\n");
+                return;
+	}
+
+        ASSERT(self != NULL, return;);
+	ASSERT(self->magic == IRCOMM_MAGIC, return;);
+
+	self->pkt_count--;
+
+        if ((self->pkt_count < 2) && (self->flow_status == FLOW_STOP)) {
+                IRDA_DEBUG(2, __FUNCTION__ "(), asking TTY to start again!\n");
+                self->flow_status = FLOW_START;
+                if (self->notify.flow_indication)
+                        self->notify.flow_indication(self->notify.instance, 
+						     self, FLOW_START);
+        }
+}
+    
+/*
+ * Function ircomm_lmp_data_request (self, userdata)
+ *
+ *    Send data frame to peer device
+ *
+ */
+int ircomm_lmp_data_request(struct ircomm_cb *self, struct sk_buff *skb, 
+			    int not_used)
+{
+	struct irda_skb_cb *cb;
+	int ret;
+
+	ASSERT(skb != NULL, return -1;);
+
+	cb = (struct irda_skb_cb *) skb->cb;
+	
+        cb->line = self->line;
+
+	IRDA_DEBUG(4, __FUNCTION__"(), sending frame\n");
+
+	skb->destructor = ircomm_lmp_flow_control;
+	
+        if ((self->pkt_count++ > 7) && (self->flow_status == FLOW_START)) {
+		IRDA_DEBUG(2, __FUNCTION__ "(), asking TTY to slow down!\n");
+	        self->flow_status = FLOW_STOP;
+                if (self->notify.flow_indication)
+             	        self->notify.flow_indication(self->notify.instance, 
+				                     self, FLOW_STOP);
+        }
+	ret = irlmp_data_request(self->lsap, skb);
+	if (ret) {
+		ERROR(__FUNCTION__ "(), failed\n");
+		dev_kfree_skb(skb);
+	}
+
+	return ret;
+}
+
+/*
+ * Function ircomm_lmp_data_indication (instance, sap, skb)
+ *
+ *    Incomming data which we must deliver to the state machine, to check
+ *    we are still connected.
+ */
+int ircomm_lmp_data_indication(void *instance, void *sap,
+			       struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+
+	IRDA_DEBUG(4, __FUNCTION__"()\n");
+	
+	ASSERT(self != NULL, return -1;);
+	ASSERT(self->magic == IRCOMM_MAGIC, return -1;);
+	ASSERT(skb != NULL, return -1;);
+	
+	ircomm_do_event(self, IRCOMM_LMP_DATA_INDICATION, skb, NULL);
+
+	return 0;
+}
+
+/*
+ * Function ircomm_lmp_connect_confirm (instance, sap, qos, max_sdu_size, 
+ *                                       max_header_size, skb)
+ *
+ *    Connection has been confirmed by peer device
+ *
+ */
+void ircomm_lmp_connect_confirm(void *instance, void *sap,
+				struct qos_info *qos, 
+				__u32 max_seg_size, 
+				__u8 max_header_size,
+				struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+	struct ircomm_info info;
+
+	IRDA_DEBUG(0, __FUNCTION__"()\n");
+
+	ASSERT(self != NULL, return;);
+	ASSERT(self->magic == IRCOMM_MAGIC, return;);
+	ASSERT(skb != NULL, return;);
+	ASSERT(qos != NULL, return;);
+
+	info.max_data_size = max_seg_size;
+	info.max_header_size = max_header_size;
+	info.qos = qos;
+
+	ircomm_do_event(self, IRCOMM_LMP_CONNECT_CONFIRM, skb, &info);
+}
+
+/*
+ * Function ircomm_lmp_connect_indication (instance, sap, qos, max_sdu_size,
+ *                                         max_header_size, skb)
+ *
+ *    Peer device wants to make a connection with us
+ *
+ */
+void ircomm_lmp_connect_indication(void *instance, void *sap,
+				   struct qos_info *qos,
+				   __u32 max_seg_size,
+				   __u8 max_header_size,
+				   struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *)instance;
+	struct ircomm_info info;
+
+	IRDA_DEBUG(0, __FUNCTION__"()\n");
+
+	ASSERT(self != NULL, return;);
+	ASSERT(self->magic == IRCOMM_MAGIC, return;);
+	ASSERT(skb != NULL, return;);
+	ASSERT(qos != NULL, return;);
+
+	info.max_data_size = max_seg_size;
+	info.max_header_size = max_header_size;
+	info.qos = qos;
+
+	ircomm_do_event(self, IRCOMM_LMP_CONNECT_INDICATION, skb, &info);
+}
+
+/*
+ * Function ircomm_lmp_disconnect_indication (instance, sap, reason, skb)
+ *
+ *    Peer device has closed the connection, or the link went down for some
+ *    other reason
+ */
+void ircomm_lmp_disconnect_indication(void *instance, void *sap, 
+				      LM_REASON reason,
+				      struct sk_buff *skb)
+{
+	struct ircomm_cb *self = (struct ircomm_cb *) instance;
+	struct ircomm_info info;
+
+	IRDA_DEBUG(0, __FUNCTION__"()\n");
+
+	ASSERT(self != NULL, return;);
+	ASSERT(self->magic == IRCOMM_MAGIC, return;);
+
+	info.reason = reason;
+
+	ircomm_do_event(self, IRCOMM_LMP_DISCONNECT_INDICATION, skb, &info);
+}